Great Physics Quotes & Sayings

The law of right-left symmetry was used in classical physics but was not of any great practical importance there. One reason for this derives from the fact that right-left symmetry is a discrete symmetry, unlike rotational symmetry, which is continuous. — Chen-Ning Yang

All right," Malcolm said. "Let's go back to the beginning." He paused, staring at the ceiling. "Physics has had great success at describing certain kinds of behavior: planets in orbit, spacecraft going to the moon, pendulums and springs and rolling balls, that sort of thing. The regular movement of objects. These are described by what are called linear equations, and mathematicians can solve those equations easily. We've been doing it for hundreds of years." "Okay," Gennaro said. "But there is another kind of behavior, which physics handles badly. For example, anything to do with turbulence. Water coming out of a spout. Air moving over an airplane wing. Weather. Blood flowing through the heart. Turbulent events are described by nonlinear equations. They're hard to solve - in fact, they're usually impossible to solve. So physics has never understood this whole class of events. Until about ten years ago. The new theory that describes them is called chaos theory. — Michael Crichton

In a lot of scientists, the ratio of wonder to skepticism declines in time. That may be connected with the fact that in some fields-mathematics, physics, some others-the great discoveries are almost entirely made by youngsters. — Carl Sagan

Yo-yo (Tagalog for "come back") evolved from a Philippine hunting tool made from a softball-size stone tied to a length of plant vine or a leather thong which enabled throwers to retrieve the weapon with a simple flick of the wrist (Hoffman 1996). The modern yo-yo thus has a great deal of physics, prehistory, and hunting lore encoded in its maple, beech, or plastic form (see below, Neuro-notes III). — David B. Givens

Apparently there is a great discovery or insight which our culture is deliberately designed to suppress, distort, and ignore. That is that nature is some kind of minded entity. That nature is not simply the random flight of atoms through electromagnetic fields. Nature is not the empty, despiritualized , lumpen matter that we inherit from modern physics. But it is instead a kind of intelligence, a kind of mind. — Terence McKenna

If physics leads us today to a world view which is essentially mystical, it returns, in a way, to its beginning, 2,500 years ago ... This time, however, it is not only based on intuition, but also on experiments of great precision and sophistication, and on a rigorous and consistent mathematical formalism. — Fritjof Capra

Fly flight is just a great phenomenon to study. It has everything - from the most sophisticated sensory biology; really, really interesting physics; really interesting muscle physiology; really interesting neural computations. — Michael Dickinson

Modern physics has changed nothing in the great classical disciplines of, for instance, mechanics, optics, and heat. Only the conception of hitherto unexplored regions, formed prematurely from a knowledge of only certain parts of the world, has undergone a decisive transformation. This conception, however, is always decisive for the future course of research. — Werner Heisenberg

All great discoveries in experimental physics have been due to the intuition of men who made free use of models, which were for them not products of the imagination but representatives of real things.
Max Born (1953) — Victor J. Stenger

A very great deal more truth can become known than can be proven. — Richard Feynman

I had a project for my life which involved 10 years of wandering, then some years of medical studies and, if any time was left, the great adventure of physics. — Che Guevara

No matter how much creativity goes into it, cooking is an art. Or perhaps I should say a craft. It abides by absolute rules, physics, chemistry, etc. and that means that unless you understand the science you cannot reach the art. We're not talking about painting here. Cooking's more like engineering. I happen to think that there is great beauty in great engineering. — Alton Brown

We get the exciting result that the total energy of the universe is zero. Why this should be so is one of the great mysteries - and therefore one of the important questions of physics. After all, what would be the use of studying physics if the mysteries were not the most important things to investigate? — Richard P. Feynman

The lovely paradox of willing compliance with what an ancient prophet called "the great plan of happiness," is that conformity to law breeds both freedom and individualism. We may think a leaping child, in the euphoria of his imagination, enjoys unfettered freedom when he tells us he is going to land on the moon. But the rocket scientist hard at work in the laboratory, enmeshed in formulae and equations she has labored to master, and slaving away in perfect conformity with the laws of physics, is the one with true freedom: for she will land on the moon; the boy will not. — Terryl L. Givens

There is only one universal language, which is the language of numbers and proportions that are so striking and stunningly built into the Great Pyramid and to which our current science has no appropriate response. We can no longer ignore that this ancient civilization was aware of our units used in modern mathematics and physics and were even aware of our metric system. Our metric system originating in the eighteenth century, designed and implemented by a committee of mathematicians and physicists commissioned by the French revolutionary government. — Willem Witteveen

The great problem of today is, how to subject all physical phenomena to dynamical laws. With all the experimental devices, and all the mathematical appliances of this generation, the human mind has been baffled in its attempts to construct a universal science of physics. — Joseph Lovering

Einstein had, for the first time connected new and measurable consequences to statistical physics. That might sound like a largely technical achievement, but on the contrary, it represented the triumph of a great principle: that much of the order we percieve in nature belies an invisible underlying disorder and hence can be understood only through the rules of randomness. — Leonard Mlodinow

As a boy, Picasso struggled with reading, writing, and arithmetic. Einstein was slow to talk and would apply picture thinking to complex problems in the field of physics. The dividing line between psychiatric disorders and great gifts is often a very narrow one and strongly depends on how someone is viewed by their surroundings. — Dick Swaab

If you want to win this argument with Dad, look in chapter two of the first book of the Feynman Lectures on Physics. There's a quote there about how philosophers say a great deal about what science absolutely requires, and it is all wrong, because the only rule in science is that the final arbiter is observation - that you just have to look at the world and report what you see. Um ... off the top of my head I can't think of where to find something about how it's an ideal of science to settle things by experiment instead of arguments - — Eliezer Yudkowsky

It would of course be a great step forward if we succeeded in combining the gravitational field and the electromagnetic field into a single structure. Only so could the era in theoretical physics inaugurated by Faraday and James Clerk Maxwell be brought to a satisfactory close. — Albert Einstein

Flying was great. You have to think fast. You have to develop intuition about the physics of air moving quickly over a surface. — James Gleick

No one must think that Newton's great creation can be overthrown in any real sense by this [Theory of Relativity] or by any other theory. His clear and wide ideas will for ever retain their significance as the foundation on which our modern conceptions of physics have been built. — Albert Einstein

After Montesquieu, the next great addition to Sociology (which is the term I may be allowed to invent to designate Social Physics) was made by Condorcet, proceeding on the views suggested by his illustrious friend Turgot. — Auguste Comte

True, the Standard Model does explain a very great deal. Nevertheless it is not yet a proper theory, principally because it does not satisfy the physicists naive faith in elegance and simplicity. It involves some 17 allegedly fundamental particles and the same number of arbitrary and tunable parameters, such as the fine-structure constants, the muon-electron mass ratio and the various mysterious mixing angles. — Sheldon L. Glashow

People will listen to sophisticated physicists, using God as a kind of metaphor for the deep constants, the deep problems, the deep principles of physics, and say that in that sense I believe in God. The reaction is, "Oh, this great physicist believes in God - that means I'm free to believe in the trinity and in the crucifixion and in the reincarnation of Christ" - and all that stuff, which of course has nothing whatever to do with the fundamental constants of physics, which is what these physicists are talking about. — Richard Dawkins

I spent the first few months of graduate school pretending to be a student of theoretical physics. This required no great acting skill beyond the effort to appear unperturbed in the face of the inexplicable, which is as far as I can see one of the central tasks of adulthood. — Barbara Ehrenreich

Not that this deterred him and his friend Klapaucius from further experimentation, which showed that the extent of a dragon's existence depends mainly on its whim, though also on its degree of satiety, and that the only sure method of negating it is to reduce the probability to zero or lower. All this research, naturally enough, took a great deal of time and energy; meanwhile the dragons that had gotten loose were running rampant, laying waste to a variety of planets and moons. What was worse, they multiplied. Which enabled Klapaucius to publish an excellent article entitled Covariant Transformation from Dragons to Dragonets, in the Special Case of Passage from States Forbidden by the Laws of Physics to Those Forbidden by the Local Authorities. — Stanislaw Lem

It can even be thought that radium could become very dangerous in criminal hands, and here the question can be raised whether mankind benefits from knowing the secrets of Nature, whether it is ready to profit from it or whether this knowledge will not be harmful for it. The example of the discoveries of Nobel is characteristic, as powerful explosives have enabled man to do wonderful work. They are also a terrible means of destruction in the hands of great criminals who lead the peoples towards war. I am one of those who believe with Nobel that mankind will derive more good than harm from the new discoveries. — Pierre Curie

A new concept of god: something not very different from the sum total of the physical laws of the universe; that is, gravitation plus quantum mechanics plus grand unified field theories plus a few other things equaled god. And by that all they meant was that here were a set of exquisitely powerful physical principles that seemed to explain a great deal that was otherwise inexplicable about the universe. Laws of nature ... that apply not just locally, not just in Glasgow, but far beyond: Edinburgh, Moscow ... Mars ... the center of the Milky Way, and out by the most distant quarters known. That the same laws of physics apply everywhere is quite remarkable. Certainly that represents a power greater than any of us. — Carl Sagan

There was a period there where I was like, "No, no, no, this is crazy. I don't want to take any more drawing classes and talk about what looks best. I want to study math and psychology and physics and all these nerdy things with computers." That was fun and great, but that didn't work out. At the end of high school, I was like, "Uhh, what's easier? Drawing is easier, I'll do that." — James Pearse Connelly

The fact that Science walks forward on two feet, namely theory and experiment, is nowhere better illustrated than in the two fields for slight contributions to which you have done me the great honour of awarding the the Nobel Prize in Physics for the year 1923. Sometimes it is one foot that is put forward first, sometimes the other, but continuous progress is only made by the use of both - by theorizing and then testing, or by finding new relations in the process of experimenting and then bringing the theoretical foot up and pushing it on beyond, and so on in unending alterations. — Robert Andrews Millikan

We can measure the fine structure constant with very great precision, but so far none of our theories has provided an explanation of its measured value. One of the aims of superstring theory is to predict this quantity precisely. Any theory that could do that would be taken very seriously indeed as a potential 'Theory of Everything'. — John D. Barrow

A saving grace of the human condition (if I may phrase it like that) is a sense of humor. Many writers and witnesses, guessing the connection between sexual repression and religious fervor, have managed to rescue themselves and others from its deadly grip by the exercise of wit. And much of religion is so laughable on its face that writers from Voltaire to Bertrand Russell to Chapman Cohen have had great fun at its expense. In our own day, the humor of scientists such as Richard Dawkins and Carl Sagan has ridiculed the apparent inability of the creator to know, let alone to understand, what he has created. Gods seem not to know of any animals except the ones tended by their immediate worshippers and seem to be ignorant as well of microbes and the laws of physics. The self-evident man-madeness of religion, as well as its masculine-madeness in respect of religion's universal commitment to male domination, is one of the first things to strike the eye. — Christopher Hitchens

Following graduation from high school in 1948, I attended Harvard University where I became a physics major. Having grown up in a small town, I found Harvard to be an enormously enriching experience. Students in my class came from all walks of life and from a great variety of geographical locations. — David Lee

neither we nor our planet enjoys a privileged position in Nature. This insight has since been applied upward to the stars, and sideways to many subsets of the human family, with great success and invariable opposition. It has been responsible for major advances in astronomy, physics, biology, anthropology, economics and politics. I wonder if its social extrapolation is a major reason for attempts at its suppression. — Carl Sagan

By the time I began my study of physics in the early 1970s, the idea of unifying gravity with the other forces was as dead as the idea of continuous matter. It was a lesson in the foolishness of once great thinkers. Ernst Mach didn't believe in atoms, James Clerk Maxwell believed in the aether, and Albert Einstein searched for a unified-field theory. Life is tough. — Lee Smolin

[Heisenberg's seminal 1925 paper initiating quantum mechanics marked] one of the great jumps - perhaps the greatest - in the development of twentieth century physics. — Abraham Pais

The great creeds of the Church are (like) the operational hypotheses in his (physics) laboratory - the best we've been able to articulate up to now, but also not the last word. Both the scientist and the mystic live boldly with the discoveries they have made, all the while anticipating better discoveries to come. Rabbi Jonathan Sacks — Krista Tippett

Until we have a firm understanding of the flow of time, or incontrovertible evidence that it is indeed an illusion, then we will not know who we are, or what part we are playing in the great cosmic drama." - Paul Davies, professor of theoretical physics and cosmology — Nina Nenova

As to your Newton, I confess I do not understand his void and his gravity; I admit he has demonstrated the movement of the heavenly bodies with more exactitude than his forerunners; but you will admit it is an absurdity to maintain the existence of Nothing.
[Letter to Voltaire, 25 Nov. 1777] — Frederick The Great

It is going to be necessary that everything that happens in a finite volume of space and time would have to be analyzable with a finite number of logical operations. The present theory of physics is not that way, apparently. It allows space to go down into infinitesimal distances, wavelengths to get infinitely great, terms to be summed in infinite order, and so forth; and therefore, if this proposition [that physics is computer-simulatable] is right, physical law is wrong. — Richard P. Feynman

So great a contribution to physics was Two New Sciences that scholars have long maintained that the book anticipated Isaac Newton's laws of motion. — Stephen Hawking

Ever since the news of Hiroshima and Nagasaki had first reached him in California, Brecht had connected Galileo's caving-in before the Inquisition as the great and perhaps ineradicable moral blot on the history of physics and the developments in modern physics that led to the atomic and hydrogen bombs. — John Fuegi

Can you name a single one of the great fundamental and original intellectual achievements which have raise man in the scale of civilization that may be credited to the Anglo-Saxon? The art of letters, of poetry, of music, of sculpture, of painting, of the drama, of architecture; the science of mathematics, of astronomy, of philosophy, of logic, of physics, of chemistry, the use of the metals and principles of mechanics, were all invented or discovered by darker and what we now call inferior races and nations. — James Weldon Johnson

I walk around in a near-constant state of inspiration with a great hunger of knowledge, and I read everything I can about math and physics, often developing my own theories along the way. — Jason Padgett

In the pursuit of my investigations I was unconsciously led into the border region of physics and physiology. To my amazement, I found boundary lines vanishing, and points of contact emerging, between the realms of the living and the non-living. Inorganic matter was perceived as anything but inert; it was athrill under the action of multitudinous forces. A universal reaction seemed to bring metal, plant and animal under a common law. They all exhibited essentially the same phenomena of fatigue and depression, with possibilities of recovery and of exaltation, as well as the permanent irresponsiveness associated with death. Filled with awe at this stupendous generalization, it was with great hope that I announced my results before the Royal Society - results demonstrated by experiments. — Paramahansa Yogananda

Neoclassical economics has effectively insulated itself from the great advances made in science and engineering over the last 40 years. This self-imposed isolation must come to an end. For while the concepts of neoclassical economics appear difficult, they are actually quaint in comparison to the sophistication evident in today's mathematics, engineering, computing, evolutionary biology and physics. In order to advance, economics must humbly submit to learning from disciplines that it has studiously ignored for so long. Some researchers in outside fields have called for the wholesale replacement of standard economics curricula, using at least the building blocks of modern thought inherent in other disciplines. — Steve Keen

We absolutely must leave room for doubt or there is no progress and there is no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty. People are terrified - how can you live and not know? It is not odd at all. You only think you know, as a matter of fact. And most of your actions are based on incomplete knowledge and you really don't know what it is all about, or what the purpose of the world is, or know a great deal of other things. It is possible to live and not know. — Richard Feynman

I have lived a long life, and I have seen a few things. I walked away from the Last Great Time War. I marked the passing of the Time Lords. I saw the birth of the universe and I watched as time ran out, moment by moment, until nothing remained; no time, no space. Just me. I walked in universes where the laws of physics were devised by the mind of a madman. I watched universes freeze and creations burn. I have seen things you wouldn't believe, I have lost things you will never understand. And I know things, secrets that must never be told, knowledge that must never be spoken. Knowledge that will make parasite gods blaze! So come on then! Take it! Take it all, baby! Have it! You have it all! — Neil Cross

Experiment is the sole judge of scientific "truth." But what is the source of knowledge? Where do the laws that are to be tested come from? Experiment, itself, helps to produce these laws, in the sense that it gives us hints. But also needed is imagination to create from these hints the great generalizations - to guess at the wonderful, simple, but very strange patterns beneath them all, and then to experiment to check again whether we have made the right guess. This imagining process is so difficult that there is a division of labor in physics: there are theoretical physicists who imagine, deduce, and guess at new laws, but do not experiment; and then there are experimental physicists who experiment, imagine, deduce, and guess. — Richard Feynman

Consider the enormity of the problem. Science has proved that the universe exploded into being at a certain moment. It asks: What cause produced this effect? Who or what put the matter or energy into the universe? And science cannot answer these questions, because, according to the astronomers, in the first moments of its existence the Universe was compressed to an extraordinary degree, and consumed by the heat of a fire beyond human imagination. The shock of that instant must have destroyed every particle of evidence that could have yielded a clue to the cause of the great explosion. — Robert Jastrow

The great object is to find the theory of the matter [of X-rays] before anyone else, for nearly every professor in Europe is now on the warpath. — Ernest Rutherford

In thinking about these questions I have been stimulated by criticisms of the prevailing scientific world picture ... by the defenders of intelligent design. Even though writers like Michael Behe and Stephen C. Meyer are motivated at least in part by their religious beliefs, the empirical arguments they offer against the likelihood that the origin of life and its evolutionary history can be fully explained by physics and chemistry are of great interest in themselves. Another skeptic, David Berlinski, has brought out these problems vividly without reference to the design inference. Even if one is not drawn to the alternative of an explanation by the actions of a designer, the problems that these iconoclasts pose for the orthodox scientific consensus should be taken seriously. They do not deserve the scorn with which they are commonly met. It is manifestly unfair. — Thomas Nagel

In the spring of 1929, I returned to the United States. I was homesick for this country. I had learned in my student days a great deal about the new physics. I wanted to pursue this myself, to explain it, and to foster its cultivation. — J. Robert Oppenheimer

Neutrino physics is largely an art of learning a great deal by observing nothing. — Haim Harari

In this book, you will encounter various interesting geometries that have been thought to hold the keys to the universe. Galileo Galilei (1564-1642) suggested that "Nature's great book is written in mathematical symbols." Johannes Kepler (1571-1630) modeled the solar system with Platonic solids such as the dodecahedron. In the 1960s, physicist Eugene Wigner (1902-1995) was impressed with the "unreasonable effectiveness of mathematics in the natural sciences." Large Lie groups, like E8-which is discussed in the entry "The Quest for Lie Group E8 (2007)"- may someday help us create a unified theory of physics. in 2007, Swedish American cosmologist Max Tegmark published both scientific and popular articles on the mathematical universe hypothesis, which states that our physical reality is a mathematical structure-in other words, our universe in not just described by mathematics-it is mathematics. — Clifford A. Pickover

One man may have some special knowledge at first-hand about the character of a river or a spring, who otherwise knows only what everyone else knows. Yet to give currency to this shred of information, he will undertake to write on the whole science of physics. From this fault many great troubles spring. — Michel De Montaigne

The facts of physics do not oblige us to accept one philosophy rather than the other...the laws of physics in any one reference frame account for all physical phenomena, including the observations of moving observers. And it is often simplest to work in a single frame, rather than to hurry after each moving object in turn...You can pretend that whatever inertial frame you have chosen is the ether of the 19th century physicists, and in that frame you can confidently apply the ideas of the FitzGerald contraction....It is a great pity that students don't understand this. Very often they are led to believe that Einstein somehow swept away all that went before. This is not true. Much of what went before survived the theory of relativity, with the added freedom that you can choose any inertial frame of reference in which to apply all those ideas. — John S. Bell

I read a lot of science books - I love cosmology, quantum theory, particle physics. So my idea of a great read would probably put you directly into a coma. — Augusten Burroughs

A great physicist taught at the Massachusetts Institute of Technology. He published many important books and papers. Often he had an idea in the middle of the night. He rose from his bed, took a shower, washed his hair, and shaved. He dressed completely, in a clean shirt, in polished shoes, a jacket and tie. Then he sat at his desk and wrote down his idea. A friend of mine asked him why he put himself through all that rigmarole. 'Why,' he said, surprised at the question, 'in honor of physics! — Annie Dillard

A crumb is a great thing: If you break a crumb in half, you don't get two half-crumbs, you get two crumbs. Doesn't that violate some law of physics? — George Carlin

A good many times I have been present at gatherings of people who, by the standards of the traditional culture, are thought highly educated and who have with considerable gusto been expressing their incredulity of scientists. Once or twice I have been provoked and have asked the company how many of them could describe the Second Law of Thermodynamics. The response was cold: it was also negative. Yet I was asking something which is the scientific equivalent of: Have you read a work of Shakespeare's?
I now believe that if I had asked an even simpler question
such as, What do you mean by mass, or acceleration, which is the scientific equivalent of saying, Can you read?
not more than one in ten of the highly educated would have felt that I was speaking the same language. So the great edifice of modern physics goes up, and the majority of the cleverest people in the western world have about as much insight into it as their neolithic ancestors would have had. — C.P. Snow

If instead of arranging the atoms in some definite pattern, again and again repeated, on and on, or even forming little lumps of complexity like the odor of violets, we make an arrangement which is always different from place to place, with different kinds of atoms arranged in many ways, continually changing, not repeating, how much more marvelously is it possible that this thing might behave? Is it possible that that "thing" walking back and forth in front of you, talking to you, is a great glob of these atoms in a very complex arrangement, such that the sheer complexity of it staggers the imagination as to what it can do? When we say we are a pile of atoms, we do not mean we are merely a pile of atoms, because a pile of atoms which is not repeated from one to the other might well have the possibilities which you see before you in the mirror. — Richard Feynman

Nature has a great simplicity and therefore a great beauty — Richard Feynman

Economics is haunted by more fallacies than any other study known to man. This is no accident. The inherent difficulties of the subject would be great enough in any case, but they are multiplied a thousandfold by a factor that is insignificant in, say, physics, mathematics or medicine - the special pleading of selfish interests. — Henry Hazlitt

This irrelevance of molecular arrangements for macroscopic results has given rise to the tendency to confine physics and chemistry to the study of homogeneous systems as well as homogeneous classes. In statistical mechanics a great deal of labor is in fact spent on showing that homogeneous systems and homogeneous classes are closely related and to a considerable extent interchangeable concepts of theoretical analysis (Gibbs theory). Naturally, this is not an accident. The methods of physics and chemistry are ideally suited for dealing with homogeneous classes with their interchangeable components. But experience shows that the objects of biology are radically inhomogeneous both as systems (structurally) and as classes (generically). Therefore, the method of biology and, consequently, its results will differ widely from the method and results of physical science. — Walter M. Elsasser

In physics, one of the most exciting areas is in nanotech. With computers exhausting the power of silicon, Silicon Valley could become a Rust Belt, unless we can find replacements, such as quantum computers and molecular computers. To be a leader in any field, one has to have a great imagination. Sure, we have to know the basics and fundamentals. But beyond that, we have to let our imagination soar. — Michio Kaku

Lederman is also a charismatic personality, famous among his colleagues for his humor and storytelling ability. One of his favorite anecdotes relates the time when, as a graduate student, he arranged to bump into Albert Einstein while walking the grounds at the Institute for Advanced Study at Princeton. The great man listened patiently as the eager youngster explained the particle-physics research he was doing at Columbia, and then said with a smile, That is not interesting. — Sean Carroll

What role do we have as human beings who perceive, make decisions, laugh, and cry, in this great fresco of the world as depicted by contemporary physics? — Carlo Rovelli

We can imagine that this complicated array of moving things which constitutes "the world" is something like a great chess game being played by the gods, and we are observers of the game. We do not know what the rules of the game are; all we are allowed to do is to watch the playing. Of course, if we watch long enough, we may eventually catch on to a few of the rules. The rules of the game are what we mean by fundamental physics. Even if we know every rule, however . . . what we really can explain in terms of those rules is very limited, because almost all situations are so enormously complicated that we cannot follow the plays of the game using the rules, much less tell what is going to happen next. We must, therefore, limit ourselves to the more basic question of the rules of the game. If we know the rules, we consider that we "understand" the world. — Richard Rhodes

I am not, however, militant in my atheism. The great English theoretical physicist Paul Dirac is a militant atheist. I suppose he is interested in arguing about the existence of God. I am not. It was once quipped that there is no God and Dirac is his prophet. — Linus Pauling

So that while others may look on the laws of physics as legislation and God as a human form with beard measured in light-years and double for sandals, Faust's kind (poets) are alone with the task of living in a universe of things which simply are, and cloaking that innate mindlessness with comfortable and pious metaphor so that the "practical" half of humanity may continue in the Great Lie, confident that their machines, dwellings, streets and weather share the same human motives, personal traits and fits of contrariness as they. — Thomas Pynchon

It is tribute to how far we have come in theoretical physics that it now takes enormous machines and a great deal of money to perform experiments whose results we can not predict. — Stephen Hawking

[About the great synthesis of atomic physics in the 1920s]
It was a heroic time. It was not the doing of any one man; it involved the collaboration of scores of scientists from many different lands. But from the first to last the deeply creative, subtle and critical spirit of Niels Bohr guided, restrained, deepened and finally transmuted the enterprise. — J. Robert Oppenheimer

If time is treated in modern physics as a dimension on a par with the dimensions of space, why should we a priori exclude the possibility that we are pulled as well as pushed along its axis? The future has, after all, as much or as little reality as the past, and there is nothing logically inconceivable in introducing, as a working hypothesis, an element of finality, supplementary to the element of causality, into our equations. It betrays a great lack of imagination to believe that the concept of "purpose" must necessarily be associated with some anthropomorphic deity. — Arthur Koestler

Physics is an otherworld thing, it requires a taste for things unseen, even unheard of- a high degree of abstraction ... These faculties die off somehow when you grow up ... profound curiosity happens when children are young. I think physicists are the Peter Pans of the human race ... Once you are sophisticated, you know too much- far too much. Pauli once said to me, "I know a great deal. I know too much. I am a quantum ancient.". — Isidor Isaac Rabi

The significance of [the fine-structure constant] goes far beyond atomic physics, however. It is the smallness of 1/137 compared to unity that enables us to treat the coupling between the electromagnetic field and a charged particle such as an electron as a small perturbation, a fact of great computational importance. [Forces of Nature] — Paul Davies

Science properly done is one of the humanities, as a fine physics teacher once said. The point of science is to help us understand what we are and how we got here, and for this we need the great stories: the tale of how, once upon a time, there was a Big Bang; the Darwinian epic of the evolution of life on Earth; and now the story we are just beginning to learn how to tell... — Daniel C. Dennett

Mister Geoffrey, my experiment shows that the dynamo and the bulb are both working properly," I said. "So why won't the radio play?"
"I don't know," he said. "Try connecting them here."
He was pointing toward a socket on the radio labeled "AC," and when I shoved the wires inside, the radio came to life. We shouted with excitement. As I pedaled the bicycle, I could hear the great Billy Kaunda playing his happy music on Radio Two, and that made Geoffrey start to dance.
"Keep pedaling," he said. "That's it, just keep pedaling."
"Hey, I want to dance, too."
"You'll have to wait your turn."
Without realizing it, I'd just discovered the difference between alternating and direct current. Of course, I wouldn't know what this meant until much later.
After a few minutes of pedaling this upside-down bike by hand, my arm grew tired and the radio slowly died. So I began thinking, "What can do the pedaling for us so Geoffrey and I can dance? — William Kamkwamba

Our job in physics is to see things simply, to understand a great many complicated phenomena in a unified way, in terms of a few simple principles. — Steven Weinberg

In the history of physics, there have been three great revolutions in thought that first seemed absurd yet proved to be true. The first proposed that the earth, instead of being stationary, was moving around at a great and variable speed in a universe that is much bigger than it appears to our immediate perception. That proposal, I believe, was first made by Aristarchos two millenia ago ... Remarkably enough, the name Aristarchos in Greek means best beginning. — Edward Teller

The test of science is not whether you are reasonable - there would not be much of physics if that was the case - the test is whether it works. And the great point about Newton's theory of gravitation was that it worked, that you could actually say something about the motion of the moon without knowing very much about the constitution of the Earth. — Hermann Bondi

Here at great expense,' [Colonel Groves] moaned to Oppenheimer, 'the government has assembled the world's largest collection of crackpots. — Steve Sheinkin